Adjustment mechanism and viewing apparatus using the same

ABSTRACT

An adjustment mechanism includes a driving assembly and a sliding assembly. The driving assembly includes a mounting base, a toggle wheel, a gear, and a rotating shaft. The gear is non-rotatablely connected to the toggle wheel. The rotating shaft is inserted through the toggle wheel and rotatably mounted at the mounting base. The sliding assembly includes a first sliding component connected to a first lens barrel and including a first rack, and a second sliding component connected to a second lens barrel and including a second rack. The gear is sandwiched between the first sliding component and the second sliding component, and is engaged with the first rack and the second rack.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of InternationalApplication No. PCT/CN2016/100207, filed on Sep. 26, 2016, the entirecontents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to optical device technology and, moreparticularly, to an adjustment mechanism and a viewing apparatus usingthe same.

BACKGROUND

As an emerging technology, 3D viewing technology has a good developmentprospect in the entertainment field. Head-mounted viewing devicesstereoscopically display a two-dimensional (2D) image more to a user byutilizing the 3D viewing technology. As such, the user experiences ahuge impact and extreme shock brought by the stereoscopic version, andhence has an immersive viewing experience. However, in the conventionaldisplay devices, a distance between two lens barrels is generally fixed,but different users have different pupillary distance (PD). As such, theuser who has the PD inconsistent with the distance between the two lensbarrels is prone to have a visual fatigue when wearing the displaydevice, thereby reducing the comfort that the display device brings tothe user.

SUMMARY

In accordance with the disclosure, there is provided an adjustmentmechanism including a driving assembly and a sliding assembly. Thedriving assembly includes a mounting base, a toggle wheel, a gear, and arotating shaft. The gear is non-rotatablely connected to the togglewheel. The rotating shaft is inserted through the toggle wheel androtatably mounted at the mounting base. The sliding assembly includes afirst sliding component connected to a first lens barrel and including afirst rack, and a second sliding component connected to a second lensbarrel and including a second rack. The gear is sandwiched between thefirst sliding component and the second sliding component, and is engagedwith the first rack and the second rack.

Also in accordance with the disclosure, there is provided an adjustmentmechanism including a driving assembly, a sliding assembly, and atransmission assembly connected between the driving assembly and thesliding assembly. The driving assembly includes a mounting base, atoggle wheel, and a rotating shaft. The rotating shaft is insertedthrough the toggle wheel and rotatably mounted at the mounting base. Thesliding assembly includes a first sliding component connected to a firstlens barrel and including a first rack, and a second sliding componentconnected to a second lens barrel and including a second rack. Thetransmission assembly includes a driving wheel fixed to the togglewheel, a driven wheel, a driving belt sleeved on the driving wheel andthe driven wheel, and a gear fixed to the driven wheel. The gear issandwiched between the first sliding component and the second slidingcomponent, and is engaged with the first rack and the second rack.

Also in accordance with the disclosure, there is provided a viewingapparatus including a housing, an optical mechanism mounted at thehousing and including a first lens barrel and a second lens barrel, andan adjustment mechanism. The adjustment mechanism includes a drivingassembly and a sliding assembly. The driving assembly includes amounting base, a toggle wheel, a gear, and a rotating shaft. The gear isnon-rotatablely connected to the toggle wheel. The rotating shaft isinserted through the toggle wheel and rotatably mounted at the mountingbase. The sliding assembly includes a first sliding component connectedto the first lens barrel and including a first rack, and a secondsliding component connected to the second lens barrel and including asecond rack. The gear is sandwiched between the first sliding componentand the second sliding component, and is engaged with the first rack andthe second rack.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a viewing apparatus according to anembodiment of the disclosure.

FIG. 2 is an exploded view of the viewing apparatus in FIG. 1.

FIG. 3 is an enlarged view of a portion III of the viewing apparatus inFIG. 2.

FIG. 4 is a partial schematic view of the viewing apparatus in FIG. 1.

FIG. 5 is a perspective view of another viewing apparatus according toan embodiment of the disclosure.

FIG. 6 is an exploded view of the viewing apparatus in FIG. 5.

FIG. 7 is a partial schematic view of the viewing apparatus in FIG. 5.

FIG. 8 is an exploded view of another viewing apparatus according to anembodiment of the disclosure.

FIG. 9 is a schematic partial view of another viewing apparatusaccording to an embodiment of the disclosure.

FIG. 10 is an exploded view of the viewing apparatus in FIG. 9.

DESCRIPTION OF MAIN COMPONENTS AND REFERENCE NUMERALS

Viewing apparatus 100, 200, 300, 400 Housing 10, 210, 310, 410 Frontpanel 11, 2110, 3110, 4110 Mounting groove 111, 2101, 3101, 4101 Window112, 2102, 3102, 4102 Top panel 12, 2120, 3120, 4120 Receiving hole  121Bottom panel 13, 2130, 3130, 4130 Side panel 14, 2140, 3140, 4140Optical mechanism 20, 220, 320, 420 Fixing plate 21, 2210, 3210, 4210Avoidance hole  211 Lens barrel 22, 2220, 3220, 4220 Barrel-body  221Engaging slot 2211 Flange  222 Adjustment mechanism 30, 230 Drivingassembly 31, 2310 Mounting base 311, 2301 Press plate 3111 Support block3112 Support bar 3113 First groove 3114 Press block 3115 Second groove3116 Guiding groove 3117 Toggle wheel 312, 2302 Body 3121 Gear 3122,2354 Anti-slip texture 3123 Central hole 3124 Rotating shaft 313, 2303Gasket 314, 2304 Guiding assembly 32, 2320 Baffle  321 Sliding groove 322 Limiting groove  323 First limiting groove 3231 Second limitinggroove 3232 Sliding assembly 33, 2330 First sliding component 331, 2331First sliding plate 3311 First connecting plate 3312 First avoidancegroove 3313 First rack 3314, 2333 First buckle 3315 Second slidingcomponent 332, 2332 Second sliding plate 3321 Second connecting plate3322 Second avoidance groove 3323 Second rack 3324, 2334 Second buckle3325 Limiting component 34, 2340 Transmission assembly 2350 Drivingwheel 2351 Driven wheel 2352 Transmission belt 2353 Lens 3240, 4240Sealing ring 3250 Dustproof pad 4250 Connecting hole 4251

DETAILED DESCRIPTION OF THE EMBODIMENTS

Technical solutions of the present disclosure will be described withreference to the drawings. It will be appreciated that the describedembodiments are some rather than all of the embodiments of the presentdisclosure. Other embodiments conceived by those having ordinary skillsin the art on the basis of the described embodiments without inventiveefforts should fall within the scope of the present disclosure.

As used herein, when a first component is referred to as “connecting” toa second component, it is intended that the first component may bedirectly connected to the second component or may be indirectlyconnected to the second component via a third component between them.When a first component is referred to as “arranged” at a secondcomponent, it is intended that the first component may be directlyarranged at the second component or may be indirectly arranged at thesecond component via a third component between them.

Unless otherwise defined, all the technical and scientific terms usedherein have the same or similar meanings as generally understood by oneof ordinary skill in the art. As described herein, the terms used in thespecification of the present disclosure are intended to describeexemplary embodiments, instead of limiting the present disclosure. Theterm “and/or” used herein includes any suitable combination of one ormore related items listed. The terms “perpendicular,” “horizontal,”“left,” “right,” and similar expressions used herein are merely intendedto distinguish names of components and not intended to limit a specificpositional relationship.

Exemplary embodiments will be described with reference to theaccompanying drawings. In the situation where the technical solutionsdescribed in the embodiments are not conflicting, they can be combined.

FIG. 1 is a perspective view of a viewing apparatus 100 consistent withthe disclosure. FIG. 2 is an exploded view of the viewing apparatus 100consistent with the disclosure. FIG. 3 is an enlarged view of a portionIII of the viewing apparatus 100 consistent with the disclosure. FIG. 4is a partial schematic view of the viewing apparatus 100 consistent withthe disclosure.

As shown in FIGS. 1 to 4, the viewing apparatus 100 includes a housing10, and an optical mechanism 20 and an adjustment mechanism 30 mountedat the housing 10. The optical mechanism 20 can be configured to performa virtual or enhanced visualization processing on an image, such thatthe user can experience a stereoscopic vision. The adjustment mechanism30 can be configured to adjust the optical mechanism 20 to adapt theoptical mechanism 20 to pupillary distances (PDs) of different people,thereby improving the comfort that the viewing apparatus 100 brings tothe user.

In some embodiments, the housing 10 includes a front panel 11, a toppanel 12, a bottom panel 13, and two side panels 14. The two side panels14 are spaced apart in parallel, and each of the two side panels 14 hasan approximately rectangular shape. The front panel 11 is connected tothe top panel 12 and the bottom panel 13. Ends of the front panel 11,ends of the top panel 12, and ends of the bottom panel 13 abut againstcorresponding sides of the two side panels 14, respectively, such thatthe housing 10 can have an approximately rectangular-shape structure.The front panel 11 has an approximately rectangular shape and includes amounting groove 111 and two windows 112. The mounting groove 111 has anapproximately rectangular shape and is opened at an approximatelycentral position of the front panel 11. The two windows 112 are spacedapart at a bottom surface of the mounting groove 111 and penetratethrough the front panel 11. In some embodiments, each of the two windows112 has an approximately elliptical shape, but is not limited thereto.The top panel 12 has an approximately rectangular shape and can beconfigured to mount the adjustment mechanism 30.

The optical mechanism 20 includes a fixing plate 21 and two lens barrels22. The two lens barrels 22 are mounted in the mounting groove 111 ofthe front panel 11. The fixing plate 21 is fixedly connected to thefront panel 11 and covers the mounting groove 111, such that the twolens barrels 22 can be limited in the mounting groove 111 and can movein opposite directions along the mounting groove 111 toward or away fromeach other. In some embodiments, the optical mechanism 20 can furtherinclude two eyepieces (not shown in FIGS. 1 to 4) that are mounted inthe two lens barrels 22.

In some embodiments, each of the two lens barrels 22 includes abarrel-body 221 and two flanges 222. The barrel-body 221 can have anapproximately hollow cylindrical-shape to facilitate an installation ofthe corresponding eyepiece. The two flanges 222 are spaced apart andfixedly connected to an end of the barrel-body 221 toward the mountinggroove 111 and extend radially outward along the barrel-body 221 to abutagainst opposite side walls of the rectangular mounting groove 111. Thetwo flanges 222 of each of the two lens barrels 22 are respectivelysandwiched between the corresponding fixing plate 21 and a bottom of thecorresponding mounting groove 111, such that the two lens barrels 22 canbe stably limited in the mounting groove 111 and can be movably mountedat the front panel 11.

The fixing plate 21 includes two avoidance holes 211 opened at positionscorresponding to positions of the two windows 112. Each of the twoavoidance holes 211 has approximately elliptical shape and a size ofeach of the two avoidance holes 211 matches the size of thecorresponding window 112. The barrel-bodies 221 of the two lens barrels22 protrude from the fixing plate 21 through the corresponding avoidancehole 211, respectively. In some embodiments, each of the twobarrel-bodies 221 includes an engaging slot 2211 at a side of thebarrel-body 211 facing toward the adjustment mechanism 30.

The adjustment mechanism 30 is mounted at the top panel 12 and includesa driving assembly 31, a guiding assembly 32, a sliding assembly 33, anda limiting component 34. The driving assembly 31 and the guidingassembly 32 are respectively mounted at the top panel 12, the slidingassembly 33 is slidably mounted at the top panel 12, and the two lensbarrels 22 are detachably connected to the sliding assembly 33. Thedriving assembly 31 can drive the sliding assembly 33 to slide along theguiding assembly 32 to adjust the pupillary distance (PD) between thetwo lens barrels 22. The limiting component 34 is fixed to the top panel12 to limit the sliding assembly 33 and prevent the sliding assembly 33from being disengaged from the guiding assembly 32.

In some embodiments, the driving assembly 31 includes a mounting base311, a toggle wheel 312, a rotating shaft 313, and two gaskets 314. Themounting base 311 is fixed to the top panel 12, and the rotating shaft313 is inserted through the toggle wheel 312 and rotatably mounted atthe mounting base 311. The two gaskets 314 are respectively sleeved ontwo opposite ends of the rotating shaft 313 to avoid a looseness betweenthe rotating shaft 313 and the mounting base 311, thereby enhancing ahand feeling of the user when toggling the toggle wheel 312.

The mounting base 311 includes a press plate 3111, two support blocks3112, and four support bars 3113. The press plate 3111 has anapproximately rectangular shape and is arranged parallel to the toppanel 12. The four support bars 3113 are vertically connected betweenthe top panel 12 and the press plate 3111, respectively, and correspondto four corners of the rectangular press plate 3111. In someembodiments, two of the four support bars 3113 are arranged at a side ofthe guiding assembly 32 and the other two of the four support bars 3113are arranged at the other side of the guiding assembly 32. Two supportblocks 3112 are respectively fixed at the top panel 12 and are locatedat the two sides of the guiding assembly 32. Each of the two supportblocks 3112 is arranged between the two support bars 3113 on the sameside, and a first groove 3114 is recessed from a side of each of the twosupport blocks 3112 away from the top panel 12 for receiving lower halfportions of the gaskets 314 sleeved on ends of the rotating shaft 313.Two press blocks 3115 are protruded from a side of the press plate 3111toward the top panel 12. The two press blocks 3115 corresponds to thetwo support blocks 3112, respectively. Each of the two press blocks 3115includes a second groove 3116 that is recessed from a side of each ofthe two support blocks 3112 toward the top panel 12 for receiving upperhalf portions of the gaskets 314 sleeved at the ends of the rotatingshaft 313.

The first groove 3114 and the second groove 3116 can cooperate with eachother to form a receiving hole (not shown in FIGS. 1 to 4), and the twogaskets 314 can be received in the receiving hole. In some embodiments,the first groove 3114 and the second groove 3116 can have anapproximately semi-circular shape, but are not limited thereto.

The toggle wheel 312 includes a body 3121 and two gears 3122. The body3121 has an approximately disk shape. The body 3121 includes anti-sliptexture 3123 along a peripheral wall of the body 3121. The anti-sliptexture 3123 can be configured to prevent a sliding phenomenon when theuser toggling the body 3121. The two gears 3122 are symmetrically fixedto two sides of the body 3121, and are arranged coaxially with thedisk-shape body 3121. The toggle wheel 312 further includes a centralhole 3124. The central hole 3124 extends through the body 3121 and thetwo gears 3122 along an axial direction of the body 3121 and the twogears 3122. The rotating shaft 313 is fixedly inserted through thecentral hole 3124, and the two ends of the rotating shaft 313 extend outof the central hole 3124, such that the two gaskets 314 can berespectively sleeved on the two ends of the rotating shaft 313.

In the embodiments, the top panel 12 includes a receiving hole 121 at aposition corresponding to the body 3121 of the toggle wheel 312. Thereceiving hole 121 has an approximately elongated shape, and isconfigured to receive a portion of the body 3121 of the toggle wheel 312that protrudes from the top panel 12, such that the body 3121 can avoidthe top panel 12 and perform a rotation state.

The guiding assembly 32 includes a plurality of baffles 321, and theplurality of baffles 321 are respectively fixedly arranged at the toppanel 12. The plurality of baffles 321 cooperate with the top plate 12to form a sliding groove 322 and two limiting grooves 323. The twolimiting grooves 323 includes a first limiting groove 3231 and a secondlimiting groove 3232. The first limiting groove 3231 and the secondlimiting groove 3232 are respectively connected to a side of the slidinggroove 322 facing the front panel 11 and extend toward the front panel11 for limiting the sliding assembly 33. The first limiting groove 3231cooperates with the sliding groove 322 to form an approximately L-shapestructure. In some embodiments, the driving assembly 31 is arrangedadjacent to an end of the sliding groove 322.

The sliding assembly 33 includes a first sliding component 331 and asecond sliding component 332. The first sliding component 331 and thesecond sliding component 332 can cooperate with each other to drive thetwo lens barrels 22 to move in opposite directions along the mountinggroove 111 toward or away from each other.

The first sliding component 331 has an approximately L-shape structureand includes a first sliding plate 3311 and a first connecting plate3312. The first sliding plate 3311 is slidably arranged at the bottom ofthe sliding groove 322, and includes a first avoidance groove 3313 andtwo first racks 3314 at an end of the first sliding plate 3311 towardthe driving assembly 31. The first avoidance groove 3313 has anapproximately elongated-shape and corresponds to the receiving hole 121of the top panel 12. As such, when the first sliding plate 3311 slidesalong the sliding groove 322, the first avoidance groove 3313 canachieve an avoidance of the body 3121 of the toggle wheel 312. In someembodiments, a length of the first avoidance groove 3313 is slightlylarger than a length of the receiving hole 121, but is not limitedthereto, as long as the length of the receiving hole 121 can satisfythat the top panel 121 does not interfere with the rotation of thetoggle wheel 312, and the length of the first avoidance groove 3313 cansatisfy that the first avoidance groove 3313 can avoid the toggle wheel312 when the first sliding plate 3311 is sliding along the slidinggroove 322. The two first racks 3314 are respectively arranged at a sideof the first sliding plate 3311 facing away from the top panel 12 andsymmetrically arranged at opposite sides of the first avoidance groove3313. The two first racks 3314 are respectively engaged with a side ofthe corresponding gear 3122 of the toggle wheel 312 facing the top panel12. When the user toggles the toggle wheel 312 to rotate toward thefirst avoidance groove 3313, the two gears 3122 can rotate with thetoggle wheel 312. The two gears 3122 are engaged with the two firstracks 3314, thus, when the two gears 3122 rotate toward the firstavoidance groove 3313, the two gears 3122 can drive the first slidingplate 3311 to slide along the sliding groove 322 and away from the firstavoidance groove 3313. On the other hand, when the user toggles thetoggle wheel 312 to rotate away from the first avoidance groove 3313,the two gears 3122 can drive the first sliding plate 3311 to slide alongthe sliding groove 322 and toward the first avoidance groove 3313.

The first connecting plate 3312 is vertically connected to an end of thefirst sliding plate 3311 away from the driving assembly 31, and ismovably received in the first limiting groove 3231. A first buckle 3315is formed at an end of the first connecting plate 3312 away from thefirst sliding plate 3311, and the first buckle 3315 can be inserted inthe engaging slot 2211 of the corresponding lens barrel 22, such thatfirst connecting plate 3312 can be engaged with the corresponding lensbarrel 22. The first sliding plate 3311 can slide along the slidinggroove 322, and drive the corresponding lens barrel 22 to slide alongthe mounting groove 111 toward or away from the other lens barrel 22 viathe first connecting plate 3312 to adjust the relative position of thetwo lens barrels 22 in the mounting groove 111.

In some embodiments, the first connecting plate 3312 has anapproximately rectangular shape, and a width of the first limitinggroove 3231 is greater than a width of the first connecting plate 3312to provide a space for the first connecting plate 3312 to move in thefirst limiting groove 3231, but is not limited thereto.

The second sliding component 332 includes a second sliding plate 3321and a second connecting plate 3322. In some embodiments, a guidinggroove 3117 is opened in the press plate 3111 at a positioncorresponding to the second sliding plate 3321. The second sliding plate3321 can be slidably through the guiding groove 3117 and arranged abovethe first sliding plate 3311. The second sliding plate 3321 includes asecond avoidance groove 3323 and two second racks 3324 at an end of thesecond sliding plate 3321 toward the driving assembly 31. The secondavoidance groove 3323 has an approximately elongated-shape andcorresponds to the receiving hole 121 of the top panel 12. As such, whenthe second sliding plate 3321 slides along the sliding groove 322, thesecond avoidance groove 3323 can achieve an avoidance of the body 3121of the toggle wheel 312. In some embodiments, a length of the secondavoidance groove 3323 is slightly larger than the length of thereceiving hole 121. The two second racks 3324 are both formed at a sideof the second sliding plate 3321 facing toward the top panel 12 andsymmetrically arranged at opposite sides of the second avoidance groove3323. The two second racks 3324 are each engaged with a side of thecorresponding gear 3122 of the toggle wheel 312 facing away from the toppanel 12. When the user toggles the toggle wheel 312 to rotate towardthe second avoidance groove 3323, the two gears 3122 can rotate with thetoggle wheel 312. Since the two gears 3122 are engaged with the twosecond racks 3324, when the two gears 3122 rotate toward the secondavoidance groove 3323, the two gears 3122 can drive the second slidingplate 3321 to slide along the sliding groove 3117 and toward the secondavoidance groove 3323. On the other hand, when the user toggles thetoggle wheel 312 to rotate away from the second avoidance groove 3323,the two gears 3122 can drive the second sliding plate 3321 to slidealong the sliding groove 3117 and away from the second avoidance groove3323.

The second connecting plate 3322 is vertically connected to an end ofthe second sliding plate 3321 away from the driving assembly 31, and ismovably received in the second limiting groove 3232. A second buckle3325 is formed at an end of the second connecting plate 3312 away fromthe second sliding plate 3321, and the second buckle 3325 can beinserted in the corresponding engaging slot 2211 of the lens barrel 22,such that second connecting plate 3322 can be engaged with thecorresponding lens barrel 22. The second sliding plate 3321 can slidealong the sliding groove 322, and drive the corresponding lens barrel 22to slide along the mounting groove 111, so as to adjust the position ofthe corresponding lens barrel 22 in the mounting groove 111.

In some embodiments, a stepped structure (not shown in FIGS. 1 to 4) canbe formed at a joint between the second connecting plate 3322 and thesecond sliding plate 3321, and a step difference of the steppedstructure can match a difference of a height of the guiding groove 3117with respect to a height of the top panel 12, such that the secondconnecting plate 3322 can slide along a bottom surface of the secondlimiting groove 3232 while the second sliding plate 3321 is slidingalong the guiding groove 3172, and can be limited between the baffles321 on the two sides of the second limiting groove 3232.

In some embodiments, the second connecting plate 3322 has anapproximately rectangular shape, and a width of the second limitinggroove 3232 is greater than a width of the second connecting plate 3322to provide a space for the second connecting plate 3322 to move in thesecond limiting groove 3232, but is not limited thereto.

In some embodiments, a connection between the first connecting plate3312 and the corresponding lens barrel 22 and a connection between thesecond connecting plate 3322 and the corresponding lens barrel 22 arenot limited to the connection manner of the buckle and the engaging slotas described above, as long as the two lens barrels 22 can be detachablyconnected to the sliding assembly 33.

The limiting component 34 is fixed to the top panel 12 to limit thefirst sliding plate 3311 of the first sliding component 331 in thesliding groove 322, thereby effectively preventing the first slidingplate 3311 from slipping out of the sliding groove 322 and furtherimproving a stability of the structure of the adjustment mechanism 30.In some embodiments, the limiting component 34 has an approximatelyelongated shape, and two ends of the limiting component 34 arerespectively fixed to the two sides of the sliding groove 322, but notlimited thereto. The limiting component 34 can also include anotherstructure, as long as the first sliding plate 3311 of the first slidingcomponent 331 can be limited in the sliding groove 322.

When the distance between the two lens barrels 22 of the viewingapparatus 100 needs to be adjusted to adapt to the PD of the user,because the two gears 3122 of the toggle wheel 312 are respectivelyengaged with the first rack 3314 of the first sliding plate 3311 and thesecond rack 3324 on the second sliding plate 3321, when the user togglesthe toggle wheel 312, the two gears 3122 of the toggle wheel 312 candrive the first sliding plate 3311 and the second sliding plate 3321 tomove in opposite directions, such that the distance between the two lensbarrels 22 can be adjusted to adapt to the PD of the user.

In some embodiments, the number of the gear 3122, the number of thefirst rack 3314, and the number of the second rack 3324 can be notlimited to two, and may be one or two or more.

In some other embodiments, both the guiding assembly 32 and the limitingcomponent 34 can be omitted.

Consistent with the disclosure, the viewing device 100 can adjust thedistance between the two lens barrels 22 by providing the adjustmentmechanism 30 and adapt the distance between the two lens barrels 22 tothe PD of the user, thereby enhancing the comfort experience that theviewing apparatus 100 brings to the user.

FIG. 5 is a perspective view of a viewing apparatus 200 consistent withthe disclosure. FIG. 6 is an exploded view of the viewing apparatus 200consistent with the disclosure. FIG. 7 is a partial schematic view ofthe viewing apparatus 200 consistent with the disclosure.

As shown in FIGS. 5 to 7, a structure of the viewing apparatus 200 shownin FIG. 5 is similar to a structure of the viewing apparatus 100 shownin FIG. 1. The viewing apparatus 200 includes a housing 210, an opticalmechanism 220 mounted at the housing 210, and an adjustment mechanism230. The housing 210 includes a front panel 2110, a top panel 2120, abottom panel 2130, and two side panels 2140. The front panel 2110includes a mounting groove 2101 and two windows 2102. The opticalmechanism 220 includes a fixed plate 2210 and two lens barrels 2220. Thetwo lens barrels 2220 are respectively arranged in the mounting groove2101 of the front panel 2110. The fixing plate 2210 is fixedly connectedto the front panel 2110 and covers the mounting groove 2101, such thatthe two lens barrels 2220 can be limited in the mounting groove 2101,and can move in opposite directions along the mounting groove 2101toward or away from each other. The adjustment mechanism 230 includes adriving assembly 2310, a guiding assembly 2320, a sliding assembly 2330,and a limiting component 2340. The driving assembly 2310 and the guidingassembly 2320 are respectively mounted at the top panel 2120. Thesliding assembly 2330 can be slidably mounted at the top panel 2120 andcan be slide along the guiding assembly 2320. The driving assembly 2310includes a mounting base 2301, a toggle wheel 2302, a rotating shaft2303, and two gaskets 2304. The sliding assembly 2330 includes a firstsliding component 2331 and a second sliding component 2332. The firstsliding component 2331 and the second sliding component 2332 cancooperate with each other to drive the two lens barrels 2220 to move inopposite directions along the mounting groove 2101 toward or away fromeach other. A first rack 2333 and a second rack 2334 are respectivelyformed at sides of the first sliding component 2331 and the secondsliding component 2332 that face each other. The difference between theviewing apparatus 200 and the viewing apparatus 100 is that theadjustment mechanism 230 further includes a transmission assembly 2350connected between the driving assembly 2310 and the sliding assembly2330. The driving assembly 2310 can drive the first sliding component2331 and the second sliding member 2332 to slide in opposite directionsvia the transmission assembly 2350. In some embodiments, thetransmission assembly 2350 includes a driving wheel 2351, a driven wheel2352, a driving belt 2353, and a gear 2354. The driving wheel 2351 iscoaxially fixed to a side of the toggle wheel 2302. The driven wheel2352 is rotatably mounted at the top panel 2120. The driving belt 2353is sleeved on the driving wheel 2351 and the driven wheel 2352. The gear2354 is coaxially fixed at a side of the driven wheel 2352 toward theoptical mechanism 220, and is sanwitched between the first slidingcomponent 2331 and the second sliding component 2332 and engaged withthe first rack 2333 and the second rack 2334, respectively. When thetoggle wheel 2302 is toggled, the driving wheel 2351 can drive thedriven wheel 2352 and the gear 2354 to rotate together through thedriving belt 2353. Because of the engagement of the gear 2354 with thefirst rack 2333 and the second rack 2334, the first sliding component2331 and the second sliding component 2332 can move in oppositedirections to adjust the distance between the two lens barrels 2220 toadapt to the PD of the user.

Consistent with the disclosure, the viewing apparatus 200 can includethe transmission component 2350 between the driving component 2310 andthe sliding component 2330, such that the driving assembly 2310 candrive the sliding assembly 2330 to slide via the transmission assembly2350, thereby facilitating the adjustment of the distance between thetwo lens barrels 2220.

FIG. 8 is an exploded view of a viewing apparatus 300 consistent withthe disclosure. As shown in FIG. 8, a structure of the viewing apparatus300 is similar to the structure of the viewing apparatus 100 shown inFIG. 1. The viewing device 300 includes a housing 310, an opticalmechanism 320 mounted at the housing 310, and an adjustment mechanism(not shown in FIG. 8). The housing 310 includes a front panel 3110, atop panel 3120, a bottom panel 3130, and two side panels 3140. The frontpanel 3110 includes a mounting groove 3101 and two windows 3102. Theoptical mechanism 320 includes a fixing plate 3210 and two lens barrels3220. The two lens barrels 3220 are respectively arranged at themounting groove 3101 of the front panel 3110. The fixing plate 3210 isfixedly connected to the front panel 3110 and covers the mounting groove3101, such that the two lens barrels 3220 can be limited in the mountinggroove 3101 and can be moved in opposite directions along the mountinggroove 3101 toward or away from each other. The difference between theviewing device 300 and viewing device 100 is that the optical mechanism320 further includes two lenses 3240 and two sealing rings 3250. Each ofthe two lenses 3240 is fixed to the front panel 3110 and covers thecorresponding window 3102. Each of the two sealing rings 3250 isarranged between the corresponding lens 3240 and the corresponding lensbarrel 3220 to seal the lens barrel 3220 and the corresponding lens3240.

Consistent with the disclosure, the viewing apparatus 300 can have thesealing ring 3250 sandwiched between the lens 3240 and the lens barrel3220. When the lens barrel 3220 moves along the mounting groove 3101 andrelative to the corresponding lens 3240, the sealing ring 3250 canprevent external dust from entering the viewing apparatus 300, furtherenhancing the viewing effect.

FIG. 9 is a schematic partial view of a viewing apparatus 400 consistentwith the disclosure. FIG. 10 is an exploded view of the viewingapparatus 400. A structure of the viewing apparatus 400 shown in FIG. 9is similar to the structure of the viewing apparatus 300 shown in FIG.8. As shown in FIG. 9, the viewing apparatus 400 includes a housing 410,an optical mechanism 420 mounted at the housing 410, and an adjustmentmechanism (not shown in FIGS. 9 and 10). The housing 410 includes afront panel 4110, a top panel 4120, a bottom panel 4130, and two sidepanel 4140. The front panel 4110 includes a mounting groove 4101 and twowindows 4102. The optical mechanism 420 includes a fixed plate 4210, twolens barrels 4220, and two lenses 4240. The two lens barrels 4220 arerespectively arranged in the mounting groove 4101 of the front panel4110. The fixing plate 4210 is fixedly connected to the front panel 4110and covers the mounting groove 4101, such that the lens barrel 4220 canbe limited in the mounting groove 4101, and can move in oppositedirections along the mounting groove 4101 toward or away from eachother. Each of the two lenses 4240 is fixed to the front panel 4110 andcovers the corresponding window 4102. The difference between the viewingdevice 400 and the viewing device 300 is that the optical mechanism 420further includes a dustproof pad 4250 having an approximately ellipticalshape, and the dustproof pad 4250 is attached to the two lenses 4240. Anouter edge of the dustproof pad 4250 is fixedly connected to the frontpanel 4110, and two connecting holes 4251 are respectively formedcorresponding to the positions of the two lenses 4240, such that the twolens barrels 4220 are respectively connected to the dustproof pad 4250through the two connecting holes 4251.

In some embodiments, the dustproof pad 4250 can be made of an elasticmaterial. When the two lens barrels 4220 are moving along the mountinggroove 4101 and relative to the corresponding lens 4240, the dustproofpad 4250 can be deformed along with a moving direction of the lensbarrel 4220 to prevent the dustproof pad 4250 from affecting themovement of the lens barrel 4220.

Consistent with the disclosure, the viewing apparatus 400 can have thedustproof pad 4250 connected between the front panel 4110 and the lensbarrel 3220. When the lens barrel 4220 moves along the mounting groove4101 and relative to the corresponding lens 4240, the dustproof pad 4250can prevent external dust from entering the viewing apparatus 400,effectively improving the viewing effect of the viewing apparatus 400.

It is intended that the embodiments be considered as exemplary only andnot to limit the scope of the disclosure. Those skilled in the art willbe appreciated that any modification or equivalents to the disclosedembodiments are intended to be encompassed within the scope of thepresent disclosure.

What is claimed is:
 1. An adjustment mechanism comprising: a drivingassembly comprising a mounting base, a toggle wheel, a gear, and arotating shaft, the gear being non-rotatablely connected to the togglewheel, and the rotating shaft being inserted through the toggle wheeland rotatably mounted at the mounting base; and a sliding assemblycomprising: a first sliding component connected to a first lens barreland comprising a first rack; and a second sliding component connected toa second lens barrel and comprising a second rack; wherein the gear issandwiched between the first sliding component and the second slidingcomponent, and is engaged with the first rack and the second rack. 2.The mechanism of claim 1, wherein: the driving assembly furthercomprises two gaskets that are sleeved on two opposite ends of therotating shaft, respectively.
 3. The mechanism of claim 1, wherein: thegear is fixedly connected to the toggle wheel; a central hole extendsthrough the toggle wheel and the gear; and the rotating shaft fixedlypenetrates through the central hole.
 4. The mechanism of claim 1,further comprising: a guiding assembly comprising a plurality of bafflesforming a sliding groove, a first limiting groove, and a second limitinggroove, the first limiting groove and the second limiting groove beingconnected to a same side of the sliding groove; wherein: the firstsliding component comprises a first sliding plate and a first connectingplate; the second sliding component comprises a second sliding plate anda second connecting plate; the first sliding plate and the secondsliding plate are slidably arranged in the sliding groove; the firstconnecting plate is connected to an end of the first sliding plate awayfrom the driving assembly and is movably received in the first limitinggroove; and the second connecting plate is connected to an end of thesecond sliding plate away from the driving assembly and is movablyreceived in the second limiting groove.
 5. The mechanism of claim 4,wherein: the first lens barrel comprises a first engaging slot at a sideof the first lens barrel that faces toward the adjustment mechanism; thesecond lens barrel comprises a second engaging slot at a side of thesecond lens barrel that faces toward the adjustment mechanism; the firstconnecting plate comprises a first buckle at an end of the firstconnecting plate that is away from the first sliding plate, the firstbuckle being inserted in the first engaging slot; and the secondconnecting plate comprises a second buckle at an end of the secondconnecting plate that is away from the second sliding plate, the secondbuckle being inserted in the second engaging slot.
 6. The mechanism ofclaim 4, wherein: the first sliding plate comprises a first avoidancegroove at an end of the first sliding plate that faces toward thedriving assembly; and the second sliding plate comprises a secondavoidance groove at an end of the second sliding plate that faces towardthe driving assembly.
 7. The mechanism of claim 6, wherein: the firstsliding plate comprises two first racks arranged at two sides of thefirst avoidance groove; and the second sliding plate comprises twosecond racks arranged at two sides of the second avoidance groove. 8.The mechanism of claim 6, wherein: the mounting base comprises a guidinggroove at a position corresponding to the second sliding plate; and thesecond sliding plate is slidably through the guiding groove and isarranged above the first sliding plate.
 9. The mechanism of claim 6,wherein a stepped structure is formed at a joint between the secondconnecting plate and the second sliding plate.
 10. The mechanism ofclaim 4, further comprising: a limiting component configured to limitthe first sliding plate of the first sliding component to the slidinggroove.
 11. An adjustment mechanism comprising: a driving assemblycomprising a mounting base, a toggle wheel, and a rotating shaft, therotating shaft being inserted through the toggle wheel and rotatablymounted at the mounting base; a sliding assembly comprising: a firstsliding component connected to a first lens barrel and comprising afirst rack; and a second sliding component connected to a second lensbarrel and comprising a second rack; and a transmission assemblyconnected between the driving assembly and the sliding assembly andcomprising: a driving wheel fixed to the toggle wheel; a driven wheel; adriving belt sleeved on the driving wheel and the driven wheel; and agear fixed to the driven wheel, sandwiched between the first slidingcomponent and the second sliding component, and engaged with the firstrack and the second rack.
 12. A viewing apparatus comprising: a housing;an optical mechanism mounted at the housing and comprising a first lensbarrel and a second lens barrel; and an adjustment mechanism comprising:a driving assembly comprising a mounting base, a toggle wheel, a gear,and a rotating shaft, the gear being non-rotatablely connected to thetoggle wheel, and the rotating shaft being inserted through the togglewheel and rotatably mounted at the mounting base; and a sliding assemblycomprising: a first sliding component connected to the first lens barreland comprising a first rack; and a second sliding component connected tothe second lens barrel and comprising a second rack; wherein the gear issandwiched between the first sliding component and the second slidingcomponent, and is engaged with the first rack and the second rack. 13.The apparatus of claim 12, wherein: the driving assembly furthercomprises two gaskets that are sleeved on two opposite ends of therotating shaft, respectively.
 14. The apparatus of claim 12, wherein:the gear is fixedly connected to the toggle wheel; a central holeextends through the toggle wheel and the gear; and the rotating shaftfixedly penetrates through the central hole.
 15. The apparatus of claim12, wherein the housing comprises: a front panel comprising: a mountinggroove configured to mount the optical mechanism; and two windows spacedapart at a bottom surface of the mounting groove and penetrating throughthe front panel; a top panel; a bottom panel; and two side panels spacedapart in parallel; wherein: the front panel is connected to the toppanel and the bottom panel; and the first lens barrel and the secondlens barrel are mounted in the mounting groove.
 16. The apparatus ofclaim 15, wherein the optical mechanism further comprises a fixing platefixedly connected to the front panel and covering the mounting groove.17. The apparatus of claim 16, wherein the optical mechanism furthercomprises: two lenses each fixed to the front panel and covering acorresponding one of the two windows; and two sealing rings eacharranged between a corresponding one of the two lens and a correspondingone of the first lens barrel and the second lens barrel.
 18. Theapparatus of claim 16, wherein the optical mechanism further comprises:two lenses each fixed to the front panel and covering a correspondingone of the two windows; and a dustproof pad attached to the two lenses;wherein: an outer edge of the dustproof pad is fixedly connected to thefront panel; and the dustproof comprises two connecting holes arerespectively formed at positions corresponding to the two lenses, suchthat each of the first lens barrel and the second lens barrel isconnected to the dustproof pad through one of the two connecting holes.19. The apparatus of claim 12, wherein: the adjustment mechanism furthercomprises a guiding assembly comprising a plurality of baffles forming asliding groove, a first limiting groove, and a second limiting groove,the first limiting groove and the second limiting groove being connectedto a same side of the sliding groove; the first sliding componentcomprises a first sliding plate and a first connecting plate; the secondsliding component comprises a second sliding plate and a secondconnecting plate; the first sliding plate and the second sliding plateare slidably arranged in the sliding groove; the first connecting plateis connected to an end of the first sliding plate away from the drivingassembly and is movably received in the first limiting groove; and thesecond connecting plate is connected to an end of the second slidingplate away from the driving assembly and is movably received in thesecond limiting groove.
 20. The apparatus of claim 19, wherein: thefirst lens barrel comprises a first engaging slot at a side of the firstlens barrel that faces toward the adjustment mechanism; the second lensbarrel comprises a second engaging slot at a side of the second lensbarrel that faces toward the adjustment mechanism; the first connectingplate comprises a first buckle at an end of the first connecting platethat is away from the first sliding plate, the first buckle beinginserted in the first engaging slot; and the second connecting platecomprises a second buckle at an end of the second connecting plate thatis away from the second sliding plate, the second buckle being insertedin the second engaging slot.